21001202839 has 2 divisors, whose sum is σ = 21001202840. Its totient is φ = 21001202838.

The previous prime is 21001202771. The next prime is 21001202879. The reversal of 21001202839 is 93820210012.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21001202839 - 2¹¹ = 21001200791 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21001202879) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10500601419 + 10500601420.

It is an arithmetic number, because the mean of its divisors is an integer number (10500601420).

Almost surely, 2^21001202839 is an apocalyptic number.

21001202839 is a deficient number, since it is larger than the sum of its proper divisors (1).

21001202839 is an equidigital number, since it uses as much as digits as its factorization.

21001202839 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1728, while the sum is 28.

The spelling of 21001202839 in words is "twenty-one billion, one million, two hundred two thousand, eight hundred thirty-nine".